// Program displays some facts about a stringpublic class DebugSeven3{public static void main(String[] args){ String quote ="Honesty is the first chapter in the book of wisdom. - Thomas Jefferson"; System.out.println("index.of('f') is: " + indexOf('f'));System.out.println("index.of('x') is: " + indexOf('x'));System.out.println("char.At(5) is: " + charAt(5));System.out.println("endsWith(\"daughter\") is: " + quote.endswith("daughter"));System.out.println("endsWith(\"son\") is: " + quote.endswith("son"));System.out.println("replace('e', '*') is: " + quote.replace('e', 'M'));}}

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The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.